13.4.2.4 MASTER_POS_WAIT() Syntax

SELECT MASTER_POS_WAIT('master_log_file', master_log_pos [, timeout])

This is actually a function, not a statement. It is used to
ensure that the slave has read and executed events up to a given
position in the master's binary log. See
Section 12.15, “Miscellaneous Functions”, for a full
description.

The following table shows the maximum permissible length for the
string-valued options.